It appears that this is a bug from Oculus. Kindly follow below steps to fix this issue.
1. Double check that App > Spec > Oculus Go is checked.
2. Re-publish with "Store" as release channel.
3. Switch Oculus Go feed manually to update feed. Clicking "Cog" icon in home feed, select "View Default Feed" and then select "View Developer Feed".
4. If the old app is installed via adb, then old app will not be refreshed. Kindly remove app installed via adb first.